Get ready for a housing shortage.As implausible as it may sound Manteca new home builders are predicting they won’t be able to meet demand later this year.The reason is simple. Buyer demand in Manteca is increasing at a rate that’s too fast to bring ready-to-build lots online. That is also why builder confidence nationwide has fallen even though new home sales are at their strongest in over six years.The National Association of Home Builders builder sentiment index has dipped in the past two months not because of a weak market but the fact demand is exceeding supplies of ready-to-build lots, building materials, and workers.Manteca home builder Bill Filios sees the shortage popping up sometime this summer.His assessment of the market - that Manteca won’t be able to meet demand although he expects some 300 homes will be built and sold this year - is echoed by several other builders.